Recent answers to When I shut down my MacBook instead of putting it to sleep, then turn it on, Firefox reverts back to an earlier version (persona) & bookmarks are gone. Why?https://support.mozilla.org/en-US/questions/9473572013-01-17T07:24:22-08:00Please update to Firefox 18. Update Firefox to the latest version
Then try reading How to fix prefe2013-01-17T07:24:22-08:00Tylerdownerhttps://support.mozilla.org/en-US/questions/947357#answer-398786